自聚焦主要由两个重要步骤组成，即相位误差估计和相位误差校正。
Autofocus generally encompasses two distinct steps, i. e. phase error estimation and phase error compensation.
在该系统设计中，以FPGA芯片作为核心器件，通过底层软件编程实现高强度聚焦超声的数字化相位调控。
In the system design FPGA slug as a key device realizes digital phase control of high intensity focused ultrasound through base software programming.
一维菲涅尔区相位修正结构具有类似于抛物柱面的聚焦特点。
One dimensional Fresnel zone phase correcting plate has its focusing characteristics similar to that of the paraboloid cylinder.
相位阵列高强聚焦超声相比目前的高强聚焦超声技术，其潜在的目的容积要更大。
Phased Array HIFU has the potential to target larger volumes of tissue than can be currently treated with most existing HIFU technologies.
在现有的相位补偿方法中，相位梯度自聚焦（PGA）算法是较好的一种。
Of the existing phase compensation methods, the phase gradient autofocus (PGA) algorithm is a better one.
研究了超声换能器阵列驱动信号的相位调控精度对阵列聚焦声场的影响。
The effect of phased accuracy of the driving signals for array transducers on focused ultrasound field was studied.
合成孔径声呐成像中，主要通过自聚焦校正剩余相位误差。
In synthetic aperture sonar imaging, the residual phase error is mainly corrected via autofocus.
提出了一种基于高阶统计量分析的相位误差估计算法，用于SAR图像自聚焦。
In this paper, a new method of phase errors estimation based on higher order statistics is proposed for SAR imagery autofocus.
基于最小熵准则的自聚焦rd算法在一般rd算法的基础上引入最小熵准则来补偿由于大斜视角引起的相位误差，改善图像聚焦效果。
RD algorithm based on minimum entropy criteria carries out the correction phase errors caused by high squint Angle via searching error coefficients for improving the imaging focus effect.
论文第二章详细分析了各种相位误差的来源及它们对图像产生的影响，对几种现有的自聚焦算法进行了描述，指出实际应用过程中应该注意的问题。
Chapter 2 introduces the sources and influences on images of all kinds of phase errors, analyzes existing some autofocusing algorithms and lays stress on considerations for application.
研究了机载合成孔径雷达运动补偿中可以补偿任意阶相位误差的相位梯度自聚焦(pga)算法，提出一种PGA快速算法。
PGA algorithm, which can compensate any-order phase error in airborne SAR motion compensation, is discussed in this article. A fast PGA algorithm is also proposed.
加权相位梯度自聚焦（PWEPGA）算法考虑了距离变化对相位误差的影响，扩展了PGA算法的应用范围。
Phase Weighted Estimation PGA(PWE PGA)is suggested which takes into consideration the range dependent phase error, so the PGA can be used in more fields.
相机的自动对焦感应点需要一些影像细节来确定相位差，光线不足或者物体细节不足都会导致聚焦困难。
The camera's AF sensors require some details in the image to determine the phase difference. It's harder for the camera to find focus when the light is dim or there is little subject detail.
通过实验对比发现，利用再现光场相位突变确定再现像聚焦位置的方法效果比较理想。
Through experiment comparison, the method for determining the position of the reconstructed image by using the phase change of the reconstructed optical field is ideal.
本文对在临界相位匹配条件下使用聚焦高斯光束在双轴晶体中产生二次谐波进行了理论分析。
Theoretical analyses are presented on the critically phase-matched second-harmonic generation (SHG) in a biaxial crystal with the focused fundamental Gaussian beams.
同相位梯度自聚焦算法相比，最小熵算法无需在图像域分离出强点目标，因而特别适用于无任何明显特征的图像。
Compared with the PGA autofocus algorithm, the minimum entropy algorithm needs not isolate prominent point target in image domain and is especially suitable for the images without specific ch...
如果声音变得越分散或者难以聚焦，那表示改变距离设定后让喇叭与其他喇叭相位不正确了。
If the sound becomes more diffuse or harder to pinpoint, it is because changing the setting is putting it out of phase with the other speaker.
论文的附录对相位梯度自聚焦的两种算法进行了较详细的推导。
In the appendix, two kind of PGA algorithms are obtained in details.
论文的附录对相位梯度自聚焦的两种算法进行了较详细的推导。
In the appendix, two kind of PGA algorithms are obtained in details.
应用推荐